Two-part reenforced-concrete sleeper



TWO-PART REENFORCED CONCRETE SLEEPER /7 h h g 1 7% x Q W March 31, 1931.

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Patented Mar. 31, 1931 UNITED STATES GABL DOEBR, F NAUMBURG-ON-THE-SAALE, GERMANY TWO-PART REENFORCED-CONGREI'E SLEEPER Application filed October 2, 1929, Serial No. 396,713, and in Germany May 30, 1927.

By the wheel loads acting simultaneously upon both ends of the reenforced concrete sleepers these latter are in their middle portions subjected to bending strain in so unfavorable a manner that they break after a short time just at those portions. In order to overcome this grave drawback it has already been proposed to divide said sleepers into two parts and to connect these parts with one another by flat iron members.

This has been effected, however, up to now in a manner by no means suited to the purpose, in that either screws are required to connect with one another two flat iron memhere to be placed separately upon the sleeper halves, which is a very unsatisfactory procedure, or the iron members do not lie in the horizontal plane of bending but stand at right angles thereto, in consequence whereof the two inner frontal ends of the sleeper halves contact so tightly with one another that neither of the halves can give way in the case of a one-sided vertical pressure, the result being a fracture.

The drawbacks hitherto experienced with sleepers of the kinds stated are obviated, according to this invention, by these features that the sleeper halves are connected at their opposite or neighbouring frontal walls (which are preferably somewhat convex) by means of an iron member inserted into one of said frontal walls and engaging the other frontal wall, either only one of these latter or both being provided with a suitable recess,

may be in connection with sleeves, the sectional area of which corresponds to the shape of the particular iron member which is to be shoved into said recess from a side of the sleeper half.

The invention is illustrated diagrammatically and by way of example on the accompanying drawing on which Figure 1 is a side-view of a reenforced concrete sleeper designed according to this invention; Figure 2 is a plan of the same; and Figures 3, 4:, 5

and 6 are views similar to the middle part of Fig. l and show four modifications, all as fully described hereinafter.

In the constructional form shown in Figs.

l and 2, a and 6 denote the sleeper halves,

and cl is the joint or gap between them. The sleeper halves are yieldingly connected with one another by a piece 6 of H-iron, which lies horizontally and is shoved horizontally into bushes c inserted from the side into the 55 sleeper halves and being firmly embedded therein. The bending stresses are taken up by the web of iron member 6, and the sleeper can yield in a suflicient measure owing to the small gaps at (Z.

In the modification shown in Fig. 3, only one of the flanges of the iron piece 6 is inserted into a bush 0; the other flange and the adjoining part of the web are firmly e1nbedded by means of concrete into the sleeper half 6.

In Fig. i the iron member 0 consists of T- iron and the fiangeless part of the web is embedded into the sleeper half 6, whereas the other part of the web with the flange is inserted into a bush 0 provided in the sleeper half 6.

In the further example shown in Fig. 5, 6 denotes a piece of flat bulb iron which is arranged practically in exactly the same manner as the piece of T-iron in Fig. 4. The bulb is inserted into a bush 0 and the other portion of the piece of iron is firmly embedded in the sleeper half b.

Finally, in Fig. 6 the bulb iron (1 has two bulbs, each of which is inserted into a bush 0 In all other respects the construction is the same as with the other examples shown. a

I claim: j 85 1. A two-part reenforced concrete sleeper, comprising, in combination with sleeper halves, the adjacent frontal faces of which are convex, a horizontal iron member extending from the sleeper half end at one of said faces to the opposite sleeper half end in the plane of contact of the said convex faces and comprising a web and a flange engaging a suitably shaped recess of the respective sleeper half.

2. A two-part reenforced concrete sleeper. comprising, in combination with sleeper halves, the adjacent frontal faces of which are convex, a horizontal iron member extending from the sleeper half at one of said faces to the opposite sleeper half end in the plane of contact of said convex faces and comprising a web and a shaped flange engaging a suitably shaped recess of the respective sleeper half.

3. A two-part reenforced concrete sleeper, comprising, in combination with sleeper halves, the adjacent frontal walls of which are convex, a horizontal iron member extending from the sleeper half end at one of said faces into the opposite sleeper half end in the plane of contact of the said faces, and comprising a web and two flanges, each of which engages a correspondingly shaped recess of the respective sleeper half.

4. A two-part reenforced concrete sleeper, comprising, in combination with sleeper halves, the adjacent frontal faces of which are convex, a horizontal iron member extending from the sleeper half end at one of said faces into the opposite sleeper half end and comprising a web and two shaped flanges engaging correspondingly shaped recesses of said ends.

5. A two-part reenforced concrete sleeper, comprising in combination with sleeper halves, the adjacent frontal faces. of which are convex, a horizontal iron member extending from the sleeper half end at one of said faces into the opposite sleeper half end in the plane of contact of the said faces, and comprising a web and a flange engaging a correspondingly shaped recess of the respective sleeper half, and a correspondingly shaped bush in said recess, said bush receiving said flange in it.

6. A two-part reenforced concrete sleeper, comprising, in combination with sleeper halves, the adjacent frontal faces of which are convex, a horizontal iron member extending from the sleeper half end at one of said faces into the opposite sleeper half end in the plane of Contact of the said faces and comprising a web and a shaped flange engaging a correspondingly shaped recess of the respective sleeper half, and a correspondingly shaped bush in said recess, said bush receiving said flange in it.

7. A two-part reenforced concrete sleeper, comprising, in combination with sleeper halves, the adjacent frontal walls of which are convex, a horizontal iron member extending from the sleeper half end at one of said faces into the opposite sleeper half end in the plane of ccntactof the said faces, and comprising a web and two flanges, each of which engages a correspondingly shaped recess of the respective sleeper half, and a correspondingly shaped bush in each of said recesses, said bushes receiving said flanges in them.

8. A two-part reenforced concrete sleeper, comprising, in combination with sleeper halves, the adjacent frontal faces of which are convex, a horizontal iron member extend- 

